[1]} reviews some of the earliest results on large-scale structure
analyses, but also points out the problem with using the increasingly popular
correlation function [2]} to characterize all structures
in the universe. “The correlation function has proved to be
extremely useful in providing such a unified description of
the clumpiness. However, it is not suitable for describing the very
long filamentary or flat structures that we encounter in superclusters,
nor does it describe the large voids between these superclusters."
